<h4 class="my-3">1.onlySelectLeaf：true + searchable：true</h4>
<ti-cascader [items]="items" [(ngModel)]="selected" [clearable]="true" [searchable]="true"></ti-cascader>
<h4 class="my-3">2.onlySelectLeaf：false + searchable：true</h4>
<ti-cascader [items]="items" [(ngModel)]="selected1" [clearable]="true" [onlySelectLeaf]="false" [searchable]="true"></ti-cascader>
